Not exactly . Running the Transgo kits with no vacuum does raise line pressure , BUT from testing i have done the line pressure tends to be erratic and a bit out of control .. It does clearly state in the Transgo instructions that vacuum must be hooked up..
With the vacuum connected it could be ok BUT again you'd need to be checking it with a vacuum gauge to ensure the pressure did rise fast enough to cope with the torque load you are throwing at the trans ..
The best way IMO is as Frank said , a manual valvebody with a good constant line pressure . You will find with this type V.B the pressures should be very stable , unlike leaving the vacuum off what you currently have .
As you've probably seen here Franks valvebodies are the best available for a C6 if you can get one .
Then build the trans up as per his specs and i think your issues will go away . All Franks setup and clearances are listed in the sticky post .. They are good tested + proven specs that work with his valvebody .
I don't know that i agree that excess line pressure eroding the planets , not heard or seen that before . After the trans is built a pressure gauge is your friend , needs to be checked then you know it is right and has a chance of living .